#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System.Web.UI.WebControls;
using System.Web.UI;
using System.Collections.Specialized;

namespace Utilities.Web.UI.Controls
{
  public class CustomCheckBox : CheckBox, IPostBackDataHandler
  {
    protected override void AddAttributesToRender(HtmlTextWriter writer)
    {
      base.AddAttributesToRender(writer);

      writer.AddAttribute(HtmlTextWriterAttribute.Value, Value);
    }

    bool IPostBackDataHandler.LoadPostData(string postDataKey, NameValueCollection postCollection)
    {
      string value = postCollection[postDataKey];
      bool isChecked = !string.IsNullOrEmpty(value);
      bool changed = (isChecked != Checked) || (Value != value);

      Checked = isChecked;
      if (value != null)
        Value = value;

      return changed;
    }

    void IPostBackDataHandler.RaisePostDataChangedEvent()
    {
      RaisePostDataChangedEvent();
    }

    public string Value
    {
      get { return (string)ViewState["Value"] ?? string.Empty; }
      set { ViewState["Value"] = value; }
    }
  }
}